Reinforcing-coil for concrete pipes.



1 G. ZWICKER.

REI-NFORCING COIL FOlR CONCRETE PIPES..

APPLICATION 11u31) FEB.1,|911.

. Patented May 28,1918;

. .[NVENTOR 1 2m-M@ ,l r I 1 #16am 'ATTORNEYS WITNESS I 4 To' all whom it may concern.'

rarer oFFlClEw] JULIUS e. zwicxnmor BERKELEY, caprronniap increase..

Be it lmown that I, JULIUS Gr. Zwioisnn, a citizen of the United States, residing 'at Berkeley, in the county of Alameda and State of California, have invented certain new and useful improvements in Reinforcing-Coils for Concrete Pipes, of which the following is aV specification..

. My invention relates to reinforcements for .concrete articles, and more particularly to a metal wire-coil for the reinforcing of tubular concrete articles, such, for example, as pipe sections.

The object of the invention is to provide areinforcing coilwhich can be easilyv and' cheaply made, and which will combine lightness with the necessary strength and' rigidity.

A further object is to providel such acoil of a form to be used in reinforcing pipe sections :having threaded or over-lapping joints, and which will beself-centering when placed within the mold.

rlfhese objects will be' more fully set forth in the following description, with reference `to the accompanying drawings, wherein-.-

veo

' of coils.

Figure 1 iis a longitudinal section vof a concrete pipe with threaded ends, showing4 my reinforcing coil, in one of its forms, in

place.

Fig. 2 is a similar View showing another form of my reinforcing coil.

lF ig. Bis-a sideview broken of my reinforcing coil, of the form of Fig. 1.

Figs. 4: and -5 are views of modified types Referring more particularly tothe drawings, the reference numeral 1 designates the concrete article within which my reinforcing coil is placed, and which isliere shown as asection or joint of' ipe having overlapping end anges 2 an 3, which maybe formed with threads, as shown, adapted to be screwed into corresponding flanges of ade/jacent pipe sections, or secured to said adjamay be formed of the same wire as the h elix 4. lllhe helix wire and the longitudinal wires are secured together at their'meeting; points, preferably by an' electric welding` inner iange 3.

Specicationof Letters Patent. Ptmtwluwmy 2%, 191%, 4

l Application ledyebruary 1, 1917. Serial No. 145,887. f

' process, as, for `example, spot-welding', so

ter .than the other end, to enable saidends to' lie within the pipe flanges 2 'and 3. This isy done by tapering lthe coil continuously, as shown in Figs. 1 and 3, so that the large end 6 mayextend into the outer iiange 2,

and the small. end 7 may extend into the Another form of coil, and particularly .forthe reinforcement of pipes of large diameter,

is illustrated in Fig. 2. In this form the larly, the inner ends 10 of said outer longi tudinal members 5 are turned inwardly, and fastened to the inner longitudinal members 5'at 11. As in the case of the previously described tapered coil of Figs. 1 and 3, this coil has an end portion 6 of a diameter suit- -able for reinforcing the outer flange 2 of the pipe, and an opposite smaller endpor tion 7 of a proper diameter to reinforce the inner pipe flange 3, while the central portion of the coil, by its double construction,

provides additional strength for the central portion of the pipe.

Referring now to both formsv of coils, it f will be seen that at the largerend 6, the

ends of the lon itudina-l' wires are turned outwardly, as s own at 12,v so that their ends are approximately flush with the outer diameter of the pipe, at the end of the flange '2 thereof. Similarly, at the smaller end 7 of the coils, :the longitudinal wires are turned inwardly, -as at 13, to bev approximately flush with Vthe inner surface of the pipe at the end of the flange 3. l Thus when the coil is placed within a mold, not shown in the drawings, preparatory to the introduction of the concrete, said coil is properly centered and positioned lineally within the mold by the ends 12 and 13 of the longitudinal members, whi h bear ico its

against the outer and inner mold surfaces respectively, and againstl the end walls thereof. A

The' construction ofmy reinforcement having its members permanently united together to form an integral structure, renders feasible the production of a reinforcement of various shapes, the tapered coil' illustrated in Figs. 1 and 3 being that preferred for use in concrete pipe sections of relatively smalll size, and at the same time producesa struct-ure of the maximum-strength andrigidity for a given weight. Many' y changes, however, may be made in the form and construction of the reinforcement, without departing from the spirit of the inven- `--tion, as expressed yin the claims hereto ap- Eended. For example, the transverse/inemers, instead of being in the formfof a continuous coil, may be a series of rings, as shown in Fig. 4; or the longitudinal members, instead of being parallel with the axis of the coil, may be disposed angularly or spirally, as shown in Fig. 5.

I claim 1. Asa reinforcement -forf concrete-pipe nally disposed members, the inner series, at one end, projecting beyond the outer series,

andthe outer series, at the ofi-vr. enld projecting beyond the inner series, t` .f extremitiesof the projecting ends of the inner series being turned inwardly and those of the outer series being turned outwardly to lie substantially Hush with the inner and outer surfaces respectively of the pipe, and associated circumferential members about and connected with the longitudinally disposed members.

In testimony whereof I have signed my lname tol this specioation in the presence ofl two subscribing witnesses.

JULIUS G. ZWICKER.

Witnesses:

-WM. F. Boo'rH, l D. B. RICHARDS. 

